Fred Davis, for example, is unhappy with his situation in Washington, so he basically was there just for show.

Then you have guys like Dallas Clark, who works for cheap while Pitta was/is out for the Ravens.

Or a guy like Dustin Keller coming back, in the meanwhile, a youngster had risen up in his place and perform well for the Dolphins.
Somebody will pay top dollars for some of these guys, leaving not much left for the rest.

Honestly, I really don't think any of this makes the Texans any better. Truthfully I just see it as more inadequate replacement.